Changes from 1.1.50 to 1.1.51

These changes are archived on ftp.crynwr.com:pub/kchanges and http://www.crynwr.com/kchanges. I cannot answer questions about Linux -- I merely summarize the kernel patches after reading them. I try to make them useful to everyone, but kernel hackers should take them with a grain of salt and read the patches themselves. The patch file is patch51.gz

• Units 2 and 3 of both floppy controllers are disabled, because switching on the motors of these drives causes system hangs on some PCI computers.
• Added logging of physical floppy write errors to allow safe writing by specialized programs.
• Some of the floppy code was NOT in a critical region, so cli/sti removed.
• Keep a bitmask of changed floppies.
• Introduced a bug into the floppy driver.
• [Get rid of special_op in hard disk driver.]
• No need for special_op unless we're resetting or recalibrating.
• Apricot networking driver cleaned up, retry counts increased.
• In aha152x SCSI driver, changed irqaction to request_irq, abort updated updates for mid-level-driver changes, accept unexpected BUSFREE phase as error condition, parity check now configurable.
• The block device filesystem driver now buffers writes.
• Deadlock detection added in fcntl()'s F_GETLK, F_SETLK, and F_SETLKW calls.
• Problem in memset using a constant character value fixed (some values would be zero instead of the constant character).
• Coalesce a memory block when a vm file is closed.
• Protect a memory block by surrounding it with unusable memory.
• arp header definition removed from rarp.c.

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